Phra Malai

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Buddha myth

...he traveled through various cosmic realms, bringing back to the Buddha reports of things that were transpiring in those worlds. In later Theravada accounts Maha Moggallana’s successor, the monk
Phra Malai, visited the Tushita Heaven to question the future buddha Maitreya concerning the time when he was to be reborn on earth in order to complete his buddha mission.